node.js how to handle change of objects and variables in callbacks

I have just started a large project with node.js and I have stumbled upon some callback nightmare issues. I have done some node.js development before, but only small stuff based on tutorials.

I have a user model and a owner model, who is the owner for that user...basically the part I am building in node.js will be a REST service so I need to send a json containing a user and it's owner name. My problem is trying to get the owner name like I would do it in ruby or php and setting it as a property..but it doesn't work.

How do people handle this kind of logic in node.js where you need to change objects in callback functions? Also I do not want it to affect performance.

I am using mysql as the database because this was a requirement. So the code is this:

//find all 
req.models.users.find({
    'id' : req.query.id
}, function(err, users) {
    if (err) console.log(err); //do something better here
    else {
        var json = [];
        users.forEach(function(user) {
            user.getOwner(function(err, owner) {
                user.accountOwner = owner.name;

                json.push(user;
            });    
        });

        res.type('application/json');
        res.send(json);
    }
});

I want to send something like this: [{ 'id': user.id, 'username": user.username, 'email': user.email, 'owner': user.owner.name' }, {...}]